1. Yes, sure.
2. I have restarted nginx & php-fpm several times with testing configs (all success).
3. I had Google XML Sitemaps before. But it has been deleted before I migrated to 5.5.
4. Of Course, I have no pages with url wp-sitemap.xml.
Now it not works. Moreover, it doesn’t work in several sites in my VPS. All sites is mine and nginx configs are the same.
php7.4-xml, php7.4-mbstring, php7.4-zip – are installed